bibby transmissions flexible couplings - powerseif required • type of prime mover • kilowatt...

Eflex and Powerpin Flexible Couplings

Bibby Transmissions Flexible Couplings

The Eflex and Powerpin range ofcouplings are non-lubricated flexiblecouplings capable of accepting parallel,angular and axial misalignment and canprovide considerable torsional flexibility.The use of flexible elements of 80 or 90Shore Hardness (90 Shore as standard)provide the couplings with a range oftorsional stiffness characteristics. Theability of these elements to absorb shockand dampen vibration is due to thestructure of the material and itsbehaviour when subjected to fluctuatingloads. The couplings are thereforesuitable for applications where shock orvibratory loads are encountered.

The flexible elements are always incontact with their mating componentsand due to their special design properties,they are able to accommodate a generousamount of misalignment even undershock load conditions.

Coupling flanges are supplied in steel upto and including size 380. larger sizes areavailable in high grade cast iron, SG ironor alternatively steel.

Assembly of Eflex and Powerpincouplings is easily made with simplestandard workshop tools (spanner andallen key). Routine maintenance consistsof checking alignment periodically, withan occasional check on the wear offlexible elements. Changing elementstakes a matter of minutes only.

Bibby Transmissions will always bepleased to provide further information.All enquiries on the couplings shown hereand on other variations of Eflex orPowerpin should be accompanied withfull details of application.

Where the static and dynamic stiffness isrequired for systems analysis, details areavailable on request.

Eflex only

For details of brake drum couplings.

Powerpin only

For details of Powerpin flexible couplings.

• Accepts parallel, angular and axial

misalignment

• Torsionally flexible

• Simple assembly

• Wide range of standard designs

• No lubrication

• 80 or 90 shore hardness close

fitting elements

• Steel or cast iron hubs

• Horizontal or vertical operation

• Brake drum or disc and special

designs available

• Parallel or Taper bore alternatives

Size Pin & Buffer BufferAssembly Assembly

72 NE070F1AK NE07BAB

90 NES090F1AK NE09BAB

















Spares Kits for Eflex Flexible Couplings

Eflex Flexible Couplings


Please note: Ratings quoted are for

couplings with the maximum number of

pins and 90A Shore buffers.

Consult Bibby Transmissions for coupling

ratings when fitted with 80A Shore Buffers.

Ratings are reduced in ratio to the actual

numbers of pins and buffers fitted.

Preferred numbers per set are available

from Bibby Transmissions.

mm snoisnemiDmm eroBxaMgnitaR gnilpuoCgnitaR gnilpuoC Coupling Weight MR2

mprmpr/WkmN ➀ (Solid Hubs) (Solid Hubs)

Size F2 F3 F4 F6 F8 F9 F12 F16 F2 F3 F4 F6 F8 F9 F12 F16 ➀ Min Max A B C D E ➀ kg ➀ kgm2

72 56000.061.1532519227022100052500.06200.00552

90 200.035.284371040953610006430.0710.05800.052326118

125 225 450 675 900 0.0235 0.047 0.0705 0.094 5800 16 50 125 50 20 3 70 6.00 0.009

145 375 750 1125 1500 0.0392 0.0785 0.1178 0.157 5500 16 58 145 65 25 5 80 10.10 0.02

165 525 1050 1575 2100 0.055 0.11 0.165 0.220 4800 22 75 165 70 25 5 100 14.70 0.037

195 1050 2100 3150 4200 0.11 0.22 0.33 0.440 4400 32 90 195 90 30 5 120 27.13 0.09

240 2250 4500 6750 9000 0.235 0.471 0.706 0.942 3600 42 110 240 105 35 5 150 46.60 0.246

290 07.002.68081605521092031060003977.1433.1988.000071057210058

320 71.103.421012605151023051070062203.2627.1151.1000220056100011

350 88.107.161522606161053061670042041.3553.275.1000030052200051

380 37.204.602542606181083081080022529.3349.2269.1005735218205781

470 02.600.092082657191074571-0241206.3107.2108.1004430085200271

510 02.900.083023657112015002-0031632.5729.3816.2000050057300052

560 05.5100.0050530108532065512-0021121.7143.5065.3000860001500043

630 00.6200.4175930109562036042-0001050.01735.7520.5000690002700084

➀ Information relates to couplings with

maximum number of pins and standard

stiffness elements. Sizes up to 380

(excluding 72) have steel hubs, others

can be offered in cast iron, SG iron or

steel.

➁ Refer to Bibby Transmissions for limited

end float or special designs.

➂ Unless specified otherwise, hubs will be

bored H7.

➃ Axial restraint of the hub on the shaft

should be provided by set screws when

transition fits are specified.

➄ All dimensions subject to confirmation.

Eflex Brake Drum Couplings


.591,561,541 eziS gnilpuoC.521,09 eziS gnilpuoC

Coupling A BD C D1 D E2 F G K BW Weight* MR2* GD2* Max Size mgkgkeroB xaM 2 kgm2 rpm

90/B04 83 4" 48 37 40 6 3 28 14.5 2.13" 2.95 0.0032 0.0128 4750

125/B06 103 6" 70 47 50 6 3 42 102 3.25" 7.82 0.0200 0.0800 3600

145/B08 135 8" 80 65 65 - 5 50 13.5 4.25" 15.64 0.072 0.288 2850

165/810 145 10" 100 70 70 - 5 60 9.0 5.00" 25.15 0.185 0.740 2250

195/B12 185 12" 120 90 90 - 5 75 22.5 5.50" 44.43 0.438 1.752 1850

90/B100 83 100 48 37 40 6 3 28 14.00 55 2.84 0.0030 0.012 4750

125/B160 103 160 70 47 50 6 3 42 10.75 82.5 9.50 0.0285 0.114 3600

145/B200 135 200 80 65 65 - 5 50 13.5 108 15.67 0.070 0.280 2850

165/B250 145 250 100 70 70 - 5 60 9.0 127 25.11 0.175 0.0700 2250

195/B315 185 315 120 90 90 - 5 75 22.5 140 48.22 0.544 2.176 1850

*Values are for couplings with no bore.

Standard sizes of brake drum couplingswith inch and metric dimensioned drumsare shown in the table below.

Larger and non-standard sizes of brakedrums can be supplied. Please consultBibby Transmissions.

Standard Sizes

Powerpin Flexible Couplings


mm ni snoisnemiD.xaM xaM*hsuBgnitaR gnilpuoC Ø Ø ØRMthgieWdeepS efaSeroB.feRfo .oNgnilpuoC 2 GD2

Size Pins Nm kW/rpm No. G rpm A B C D F H kg kgm2 kgm2

900/F6 6 228 0.0239 1008 25 4750 90 53 25 48 3 17 2.0 0.0018 0.0072

1250/F8 8 400 0.0419 1215 32 4500 125 83 40 70 3 20 5.2 0.0083 0.0332

1450/F8 8 680 0.0712 1815 42 4250 145 85 40 80 5 25 8.0 0.018 0.072

1650/F8 8 880 0.0922 2017 50 3750 185 99 47 100 5 25 11.4 0.032 0.128

1950/F8 8 1600 0.1676 2525 60 3400 195 135 65 120 5 30 20.7 0.078 0.312

2400/F12 12 3780 0.3959 3030 75 2750 240 165 80 150 5 35 37.7 0.212 0.848

2900/F12 12 7500 0.7854 3535 90 2300 290 188 91 180 8 50 68.4 0.602 2.408

3200/F12 12 10200 1.0682 4040 100 2000 320 216 105 210 6 50 93.7 0.964 3.856

3500/F12 12 14520 1.5206 4545 110 1900 350 246 120 225 6 60 127.7 1.600 6.400

3800/F12 12 18300 1.9164 5050 125 1750 380 266 130 245 6 60 158.7 2.282 9.128

.erob on htiw sgnilpuoc rof era seulaV Ø.dradnats naht rewollahs syawyek evah erob mumixam ta sehsuB repaT*

The use of readily available standardTaper Bushes to lock the Powerpincoupling flanges on to their respectiveshafts means they are ready forimmediate service. The Taper Bushesenter the coupling hubs from the flangeend of the hubs as standard. Hubssuitably machined to accept Taper Bushesfrom the reverse direction are availableto order.

Information RequiredType of Prime Mover•

Kilowatt (kW) or Torque Rating•

Rotational speed rpm•

What application the coupling •is to be used on

Type of duty (eg. reversing or •unidirectional, frequency of starts and peak torques)

Diameter of drive and driven shafts•

Any limitation of axial travel•

Any other physical limitations•

Any other specific needs•

Note: Where high peak loads can occur and for brake applications please contact Bibby Transmissions.

The system peak torque is the •maximum load created by the driving or driven equipment.

Occasional peak torques of twice the •catalogue rating can be accommodated providing they occur less than 1000 times during the life of the coupling.

For drives where the operation is near or •actually passes through a major torsional natural frequency, a mass elastic analysis of the system is advised. When the Service Factor in Table 1 is greater than 2 consult your supplier or Bibby Transmissions.

Having selected the coupling type and size, now check the following.

that the coupling running •speed is lower than the permitted maximum.

that the shaft spacing •and coupling dimensions can be accommodated.

that the maximum bore •is suitable for the shaft. (If not, go to next size above and check again).

acceptability of key •stresses and boss strength for your specific duty. Refer to Table 3.

Table 2

Number of Cylinders Service Factor

6 and over 0.5 + S.F. Table 1

4 or less 1.0 + S.F. Table 1

Less than 4 Refer to Bibby Transmissions

Temperature Factors (ST)

Temp 30oC 40oC 50oC 60oC 70oC

ST 1.0 1.1 1.25 1.5 2.0

Table 3

Maximum Coupling Bore Sizes

Duty Class Load Classification Max. Bore Size

Uniform Steady load, soft start, very rarely subjected to maximum loading

Catalogue Maximum Bore

Medium Steady load with superimposed cyclic load fluctuations

Boss Diameter

1.45

Heavy Repeated maximum load fluctuations/ shock loads

Boss Diameter

1.5

Extra Heavy Regularly subjected to fully reversing maximum loads

Boss Diameter

1.6

Table 1 – Service FactorsComplimentary to customers specialist knowledge of their own equipment

Torque Demands Driven Machine

Typical applications for electric motor or turbine driven equipment

Typical Service Factor

Constant Torque such as Centrifugal Pumps, Blowers and Compressors

1

Continuous duty with some torque variations including Extruders, Forced Draft Fans

1.5

Light shock loads such as Briquetting Machine, Rubber Calendar or Crane and Hoist

2

Moderate shock loading as expected from a Car Dumper, Ball Mill or Vibrating Screen

2.5

Heavy shock load with some negative torques from Crushers, Hammer Mill and Barking Drum

3

Applications like Reciprocating Compressors with frequent torque reversals, which do not necessarily cause reverse rotations

Consult Bibby Transmissions

Coupling Selection Procedure

Is duty reversing?

Calculate torque

Select preferred coupling typeand obtain transmitted power

c = 0.102 for peak torque in Kgfmc = 1 for peak torque in Nm

Calculate torqueNm = peak torque x ST c

Nm = (transmitted)kW x SF x ST x 9555

RPM

Select coupling type from dimension tables having

coupling rating exceeding calculated torque value above

Nm = peak torque x 2 x ST c

Select Service Factor from Table 1

If reciprocating engine drive addadditional factor from Table 2

Is system peak torque known?

No

No

Yes

Yes

Bibby Coupling Selection (If in doubt please consult your supplier)

bibby transmissions flexible couplings - powerseif required • type of prime mover • kilowatt...

Documents